HINF 265 MIDTERM 1 QUESTIONS WELL
ANSWERED PRACTICE TEST BANK 2026
TESTED QUESTIONS WITH ANSWERS
GRADED A+
⩥ When doubling the distance from the noise source, overall SPL
decreases by how many dBL's? Answer: 6
⩥ What is the AF regulations for the risk of unprotected ears? Answer:
140
⩥ Exposures to steady state/ or interrupted noise is permitted? Answer:
85 dBA for 480 min/8hrs
100 dBA for 15 mins
91 dBA for 120 mins/ 2hrs
⩥ two identical noise sources placed next to eachother, noise is
increased by? Answer: 3 dBA
⩥ Main characteristics of noise-induced hearing loss? Answer: High
frequency hearing loss, notch at 400hz, bilateral, and tinnitus
,⩥ Background noise interferes with communication at what dB level?
Answer: 50 dBA
⩥ Primary goal of USAF HCP? Answer: Prevent noise induced hearing
loss
⩥ Routine exposure to noise can damage? Answer: hair cells, inner ears,
cochlea
⩥ Routine exposure to noise can not damage? Answer: ossicles (bones
in ear)
⩥ How many days does OHC have to send to the PTS? Answer: 21
(additional 10 days)
⩥ Frequency range of hearing from human ear? Answer: 20-20,000 Hz
⩥ What is testible? Answer: 500, 1000, 2000, 3000, 4000, 6000, 8000
⩥ What is not required for OHC testing? Answer: masking selector
⩥ Most important calibration procedure? Answer: daily biological check
, ⩥ If 40-70 dB is poorer in one ear, OHC suspects? Answer: crossover or
lateralization
⩥ Not an element of USAF HCP? Answer: calibration
⩥ OCMED Answer: education, disposition, noise assessment
⩥ Presbycusis? Answer: Hearing loss due to age
⩥ Frequency that hearing loss first occurs? Answer: 4000 Hz
⩥ when are medical maintenance electroacoustic calibration checks
required? Answer: 1 time a year (MERC does it) or when audiometer is
out of calibration
⩥ Occupational hearing conservationist is qualified to preform? Answer:
Air conduction pure tone testing
⩥ Ultimate solution to industrial noise? Answer: Engineering Controls
⩥ When a worker just came from high noise levels, they demonstrate?
Answer: Temporary Threshold Shift
ANSWERED PRACTICE TEST BANK 2026
TESTED QUESTIONS WITH ANSWERS
GRADED A+
⩥ When doubling the distance from the noise source, overall SPL
decreases by how many dBL's? Answer: 6
⩥ What is the AF regulations for the risk of unprotected ears? Answer:
140
⩥ Exposures to steady state/ or interrupted noise is permitted? Answer:
85 dBA for 480 min/8hrs
100 dBA for 15 mins
91 dBA for 120 mins/ 2hrs
⩥ two identical noise sources placed next to eachother, noise is
increased by? Answer: 3 dBA
⩥ Main characteristics of noise-induced hearing loss? Answer: High
frequency hearing loss, notch at 400hz, bilateral, and tinnitus
,⩥ Background noise interferes with communication at what dB level?
Answer: 50 dBA
⩥ Primary goal of USAF HCP? Answer: Prevent noise induced hearing
loss
⩥ Routine exposure to noise can damage? Answer: hair cells, inner ears,
cochlea
⩥ Routine exposure to noise can not damage? Answer: ossicles (bones
in ear)
⩥ How many days does OHC have to send to the PTS? Answer: 21
(additional 10 days)
⩥ Frequency range of hearing from human ear? Answer: 20-20,000 Hz
⩥ What is testible? Answer: 500, 1000, 2000, 3000, 4000, 6000, 8000
⩥ What is not required for OHC testing? Answer: masking selector
⩥ Most important calibration procedure? Answer: daily biological check
, ⩥ If 40-70 dB is poorer in one ear, OHC suspects? Answer: crossover or
lateralization
⩥ Not an element of USAF HCP? Answer: calibration
⩥ OCMED Answer: education, disposition, noise assessment
⩥ Presbycusis? Answer: Hearing loss due to age
⩥ Frequency that hearing loss first occurs? Answer: 4000 Hz
⩥ when are medical maintenance electroacoustic calibration checks
required? Answer: 1 time a year (MERC does it) or when audiometer is
out of calibration
⩥ Occupational hearing conservationist is qualified to preform? Answer:
Air conduction pure tone testing
⩥ Ultimate solution to industrial noise? Answer: Engineering Controls
⩥ When a worker just came from high noise levels, they demonstrate?
Answer: Temporary Threshold Shift
